15 - Interference and Diffraction

# 15 - Interference and Diffraction - Physics 8B 15...

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Physics 8B 15 – Interference & Diffraction rev 4.0 1. Consider two radio towers separated by 300m. They broadcast identical signals of wavelength λ = 200 m (AM radio 1500 kHz). A is located 10 km east from the midpoint of the towers as shown. B is located 600 m north of tower 1. C is located 700 m north of tower 1. a) Q: Do the two signals interfere completely constructively, completely destructively, or somewhere in between at A? b) Q: Do the two signals interfere completely constructively, completely destructively, or somewhere in between at B? c) Q: Do the two signals interfere completely constructively, completely destructively, or somewhere in between at C? d) P: For what angle (or angles) will the two signals interfere destructively at D? C B A 1 2 θ D

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15 – Interference & Diffraction rev 4.0 2. Red light of wavelength 650nm falls on two narrow vertical slits whose separation is 1.3 × 10 -4 m. An interference pattern is formed on a screen 1.6m away. a) Q: Describe the pattern seen on the screen. b) P: What are the locations of the dark bands on the screen? c) P: What is the width of the central maximum? d) P: The slit separation is halved compared with the original separation. What is the width of the central maximum now? e) Q: Blue light is substituted for the red light. Does the spacing between the dark bands remain the same, decrease, or increase? Explain.
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15 - Interference and Diffraction - Physics 8B 15...

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